KoschtIT Image Gallery

KoschtIT Image Gallery is a free and open-source image gallery PHP-script. It can be used to add image galleries to existing webpages very easily. The appearance of each gallery can be individually customized. The only prerequisite for using the script is PHP5 with GD2 support. The pictures aren't displayed in an extra window, instead they are opened directly on top of your HTML document. Therefore your website background gets shaded.
There is also an admin panel, which enables the site administrator to write picture comments and edit gallery settings. Gallery visitors can write viewer comments to any picture. Navigation via keyboard is available too. More features are: slidewhows, automatic thumb generation, image to window size reduction, image preloading, previews for the next/last picture, show geotagging information (via EXIF)...